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https://cerosetenta.uniandes.edu.co/especiales/medicamentos/chi/cuanto-dura-el-efecto-de-la-viagra-de-25-mg.html reaches its maximum effectiveness two hours after you take it. However, it stays in your body for up to 36 hours and can be taken every 24 hours, so it can work for you constantly. Both Cialis and Viagra are effective at these doses. Your healthcare provider can help you determine the right dosage for you.